text: Ext.define('KitchenSink.view.d3.sencha.TreeController', {
      extend: 'Ext.app.ViewController',
      alias: 'controller.sencha-tree',
  
      onTooltip: function(component, tooltip, node, element, event) {
          var record = node.data,
              name = record.get('name'),
              title = record.get('title'),
              html = '<span style="font-weight: bold">' + name + '</span><br>' + title;
  
          tooltip.setHtml(html);
      }
  
  });
  